Abstract #301721

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JSM 2002 Abstract #301721
Activity Number: 317
Type: Contributed
Date/Time: Wednesday, August 14, 2002 : 10:30 AM to 12:20 PM
Sponsor: Biometrics Section*
Abstract - #301721
Title: Statistical Methods for Assessing Survival of Human Pathogens
Author(s): Shailendra Banerjee*+
Affiliation(s): Centers for Disease Control and Prevention
Address: 5375 Country Lake Court, Lilburn, Georgia, 30047, U.S.A>
Keywords: Survival ; Comparison ; Materials ; Models
Abstract:

Study of the survival of bacterial species in environment is an important research for some time. Many studies have looked into the survival of human pathogens in the laboratory on environmental surfaces under artificially created external factors. Thus, it was found in laboratory experiment that E. Coli and Pseudomonas aeruginosa could survive on glass, tile, and stainless steel from two days to seven days, depending on relative humidity. Several factors that influence the survival are: chemical and physical characteristics of the substrate material, air temperature and relative humidity, organism's growth phase, and cell surface characteristics, etc. In this study, two strains of the same organism have been prepared in two suspension mediums at relatively the same temperature and humidity. They were tested for survival in coupons made of different materials--namely, stainless steel, polyethylene, glass, and paper. Several statistical comparison methods will be used to test how long the bacteria can survive. Furthermore, it will be interesting to find out which factors are more important than others for survival of bacteria. Appropriate models will be used to find the importance of factors.

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Revised March 2002